Air lift-pump.



Patented Apr. 3, |900.

6. H, EVANS. .AIR LIFT PUMP. "Applieation med Jan. 2e, 18'99.)

(No Model.)

T Noam: Vifzns co.. PHon L|11 o.. WASHINGTON, nA c.

Y UNITED STATES PATENT OEEICE.

GEORGE HENRY EVANS, OF'OROVILLE, CALIFORNIA, ASSIGNOR OF ONE- HALF TO THE RISDON IRON AND LOCOMOTIVE WORKS, OF SAN FRAN CISCO, CALIFORNIA.

AIR LIFT-PUMP.

SPECIFICATION forming part of Letters Patent N o. 646,640, dated April 3, 19O.

i i Application filed January 26, 1899 Serial N0. 703.429. (NO DlOdeI.)

.To all whom it may concern:

Be it known that I, GEORGE HENRY EVANS, a subject of the Queen of Great Britain, residingat Oroville, in the county of Butte and State of California, have invented certain new and useful Improvements in Air Lift-Pumps; and I do hereby declare thatthe following is a full, clear, and exact description thereof.

The present invention relates to certain new and useful improvements in that class of hydraulic.' mechanism known as air liftpumps; and it consists in the arrangement of parts and details of construction as will bev expelled from the -said column-pipe.` With l the air lift-pumps as now constructed the ef- Aiciency of the same is dependent upon the submergence given to the column-pipe,which must be to such an extent or depth that the hydraulic pressure due to the immersion does not quite equal the pressure of the compressed air forced into the botto-m of the column-pipe. With the present air lift-pumps the height to which the water may be elevated is entirely dependent upon the submergence given to the column-pipe-z'. e., if it is desired to elevate the water fifty feet from a well asubmergence of about seventy-fi Ve feet should be provided for. Inasmuch as it is not at all times possible to obtain the required submergence, at least not without going to considerable expense, the use of this form or style of pump is considerably limited.

The object of my invention is to dispense with this excessive submergence now required and so arrange that a submergence of the column-pipe of a few feet will give the same efficiency to the air 1ift-pump as is now obtained bya submergence proportionate about one and a half to one. However, the main object is to dispense with the snbmergence at present required and to overcome the expense attached to the'sinking of a well to such depth to obtain the required submergence.

vbase, and water-ejector nozzle.

In order to comprehend the invention, reference must be had to the accompanying sheets of drawings, forminga part of this application, wherein- Figure l is a side view in elevation, showing the arrangement of the air lift-pump withina well. Fig. 2 is a similar view illustrating in vertical section the column-pipe, its

Fig. 3 is al top plan view taken on line m, Fig. 2; and Fig. 4 is a similar View taken on line'y y, Fig.2. f

y The letter A is used to indicate the co1umnpipe, to the lower end of which is'attached the flared or bell-mouth base A. This base is provided with a throat a. and an outer air-chamber d', which is formed in the present case by means of the circular flanged ring A?, which surrounds the upper portion ofthe base and is attached thereto-in any well-known manner.- Into this air-chamber extends the airinlet pipe B, to which the lower end of the air-supply pipe B is connected. This pipe leads from a receiver B2, which receives air from an air-compressor located at C, the air 'which pipe extends downward alongside of the air-pipe B and connects with an ejector or discharge-nozzle C3, litted within the enlarged opened mouth of the `base A', the said pipe being held in place at its lower end by means ofthe bracket D, depending from the base. By means of this pipe C2 water is conveyed from the receiving-tank C5 and dis'- charged into the base through the ejector or nozzle C3, the iiow of water being controlled by the cock b. By preference a Water-supply pipe of about two inches in diameter is employed and an air-supply pipe of about one and one-half inches in diameter, while a ten-inch column-pipe is utilized. The pres- IOO sure of the water discharged from the ejector Cinto the base is dependent upon the elevation of the body of water within the receiving-tank. This should be so arranged that the pressure of the water slightly exceeds that of the air. The pressure of water forced into the column-pipe throughthe base serves the saine purpose as the body or pressure of water obtained by deep submergence of the eolu in n-pipe. Hence I am enabled, the pressure of the ejected water being proportionate to the lift required, to dispense with such deep submergence and obtain the saule result by a submergence of only a few feet ofthe columnpipe-say from two to five feet. By this auxiliary pressure-column, so to speak, the expense of digging a deep well in order to secure the usual depth for submergence is obviated and the same result accomplished as is now obtained by the deep subrnelgence. If so desired, the base and auxiliary pressurepipe may be attached to existing air liftpumps. As the water' is ejected from the auxiliary pipe into the column-pipe a vacu u m is created, which draws the water from the well into the column-pipe, the pressure of the ejected stream of water serving to litt the body of water inwardand hold it against dowm 'ard movement until acted upon by the current of air ejected into the column-pipe above the water-ejector. The water is then acted upon by the com pressed air forced therein, which answers as a piston, by means of which the water is elevated to the required height.

It is obvious that in place of water being ejected under pressure into the column-pipe through the base steam may be forced through the auxiliary pipe with equally good results. However, I prefer to utilize acolumn of water, owing to the simplicity in the arrangement of the parts required for the air-lift.

Having thus described my invention, what I claim as new, and desire to secure protection in by Letters Patent, is-

In an air lift-pump the combination with a discharge or column pipe having an inletopening in its base, and a series ot' air-jet openings above the inlet-opening, means for forcing air through the jet-openings, a tank above the pump and into which the pipe discharges, and a hydraulic water-supply pipe leading from the tank to the base of the column-pipe 'having an upturned nozzle on its lower end arranged in line with the interior of the column-pipe for the purpose specified. In testimony whereof I ailix my signature, in presence of two witnesses, this 16th day of January, 1809. f I

GEORGE HENRY EVANS. ftnessest I JOHN II. SARSFIELD, EDMUND llanvnv. 

